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There are 2 primary ways that auto corporations have lessened the level of air pollution brought on by automobiles. Starting up from the 1970’s, catalytic converters were being installed from the exhaust devices of vehicles. Catalytic converters lessen pollution by minimizing the gases produced in the air. Also, auto providers have built vehicles

Challenging rock mining extracts gold encased in rock, rather then fragments in unfastened sediment, and produces most of the planet's gold. Occasionally open-pit mining is employed, such as within the Fort Knox Mine in central Alaska. Barrick Gold Corporation has among the largest open up-pit gold mines in North The us Found on its Goldstrike mine